Vehicle-lamp.



5.1. EDWARDS. VEHICLE LAMP.

APPLICATION min NAR. 4. 1915.

Pan'e Feb. 6, 1917.

the ollowiV wensen.

fiom mog! @ome/11122,.' n ynown ho Even' l1 EDWARDS, i" N of' the 'United Sintes, resiing in Cli'ieloiil""eonnyu of ."njiohoga, Siete of 'lhio, have i'nvened certain new' and useful iiiiproveinens in Vehicle-Lamps, which .fi siieoiiiooiion. oliv imeniiion relnres io lamps for autoi and o'iher ixehiolz-xs7 and moreh'peirticulhrlj; ineens 'wleieloy the @flore from such n i; e. illuminating eiiiciency is in- .regillziions Whieh are in groei; ronny iocoiiries, it is neceshe lirfhjt shall not he ironsniitted above *she horizontal plane :i `he ligha ksinnoeso that occupante of oher Veihconvenienced by alle giuro. `Lons means have heen proposed for zieoonrplishing this purpose, het proclaimlly lill of them have 'lie disadvantage thai whilozliey moet the Concliilons imposed by ihe. regjulaiions 'ioo ceritoin extent, they Clo so the expense of efficiency. According ibo my inveniiont are provided for preventii i'he li-ionsniission of light above the horizonol onli he shine time iho light which would ordinarily he lost on this :iocosini reclireeiefl so theit illuminates 4alle rmul immediately in freni of ihe vehicle, invliiilingi he curbing.3 and thus enables ille driver :o heiaer guide lie vehicle.y

My invention ,villoe more clearly undersioocl to accompanying T#M -ich ino forms of apparatus i embodying injr invention. liows io he nndeisiooii that hese :ire

' ilccoi eel seoirion of one of is o from elevaiion e eliogreinnmtie side s :igreinmaiic front eleiomn einhofljfi 1 ing oi" on miioniohile l in vpe. This lmnp eoinolisef also he lens ll moilned in the iiron is en eleezrio inca r lziinp having v componen-steil 'lilninen li, Whivli luminoso; im-

of heitere Ene-frne.

Application le Merola 4,' i915.

Serial lilo, MLM@ lecor lll, ywhich is preferably parabolic.

F'g. l the parabola sl'iown is a Vertical Sec- 'iion of o paroboloid, but 'the elecivo poi'- "ion of the paraboloid is that part of its shell which extends below the horizontal axial plone or" segmenieion, the poriion exienf'ling above the horizontal 'plane being shown in Fig. Il only for the purpose of indiennne;

how the invent-ion may he adapted to exisiti'ng headlights which are usually provided wiizh parabolic reflectors. i

Mouneol over the ligh source and haiiing its sicles preferably extending@suhsanibially down to the horizontal plane including saidlight source is the device which conseitues the salient eoiure of my invention. This olevioe` has subsaniolly he forni of the half'o on lellipsoicl of revoiution, and since it extends down io the horizontal plane including the light source, no direct rays.

from the latter can go onil into the field alcove the horizon. Here nga-in Fig. l shows n von tic-(il section, namely7 :i vertical axial section of en ellipsoicl of ievolniioii7 but fhe device :is used is the shell or the greaerpart ofthe shell of *che half of on ellipsoicl which extenfls ebow the horizontal plane of segnientotoin passing 'through me major axis; .the ellipsoicl itself being a. prolafe ellipsoiclu @hat is to say5 one hot is generated by in ellipse i'oziaing about its mejor exis. ln the por tioulnr embodiment illusirateol the device' is ettened ai its front. end lo for oon-- Yenience in mounting. AS Shown in 2, olie device l5 may be mounted, :is by ineens of straps l?, to the rim 18, ilo which is also attached the parabolic reflector l, rlhe disposition of the described perils is preferably such that the light source, liloinent. 13, is disposed ai, one of the oei of the half ellipsoii, formed by :i longitudinal axial hoi'izonal Section of: she pero i5. The construct-ion should he such ihai, the either focus is located near the fletened enel porabove ille horizontal will be redireCi/od by f' the relector l5 through the other focus. This ligh will :ill he directed downwardly so :is to illmninoe the road et points near the front of the vehicle where the lamp is mounted. t the same time this light will spread out over a considerable area, thus enablihg the driver to seethe curb and as- V sisting him in guiding the vehicle.

The position of the parabolic reflector la relative to the light source is preferably such. that the latter will. be slightly in back of the focus of the paraboloid. This locates Athe focus of the paraboloid between the foci of the ellipsoid but rather close to'one of them and this causes all light transmitted downwardly from the light source to be re directed lslightly downwardly by the parabolic reflector, thus removing any doubt as to compliancewith the regulations hereinbefore referred to.

In Figs. 3, 4 and 5 a modification is shown, in which ellipsoidal reflector shell 19 is fastened to the horizontally extending plate 2O forming a cover for the semi-para.-

bolic reflector 21. As shown in Fig. 5, the provision of the fastenings 22 with slots 23 allows the adjustment of the reflector shellv 19 with reference to the semi-parabolic ref flector 21, and therefore with respect to the light source.

It will be seen from the foregoing that in bothI forms of the reflector here shown the axes and the section planes of the ellipsoidal and paraboloidal portions coincide, the ellipsoidal part extending on one side and the 'paraboloid al part on the other side o f the common section plane. The upper part of the reiector, therefore, presents a surface which is the segment of the surface of a prolate ellipsoid of revolution cut od by a horizontal planethrough its major axis, While the lower part of the redectcr presents asurface which. is the asegment of the surface of a parabcloid cut off by a horizontal plane i through its axis.

Various modifications. of the above described device will readily occur to those skilled in the art and are to lbe considered as loid being between the foci of the ellipsoid and lone of the shells extending on one side and the other on the opposite side of the common plane of segmentation.

2. In a vehicle lamp, the combination of the shell of a segment of the surface of a prolate ellipsoid of revolution delimited by a substantially horizontal plane of segmentation through the maj or axis and the shell of an axial segment of thesurface of a paraboloid, the axes and planes of segmentation coinciding1 the ellipsoidal shell extending above and the paraboloidal shell below the com- -imon lane of segmentation, with a' concen trate source of iight substantially one of the foci of the ellipsoid and in the 'rear of the focus of the paraboloid.

In witness whereof, l have hereunto set my hand this 2nd day of March, 1915.

Witnesses:

W. L. KUBACH, ,CHESTER L. Dows. 

